android圆形倒计时领奖,Android模仿圆形圆圈倒计时实现
现在看到很多App的开屏图都是画一个圆圈，从0度画到360度，然后倒计时三秒。感觉挺好玩，刚才忍不住写了一个，贴一下代码：
/**
* weichenglin create in 17/1/25
*/
public class CountDownCircleView extends TextView {
private static final int COUNT = 3;
final float PADDING = dip2px(1f);
Paint mPaint = new Paint();
float mAngel = 0f;
private volatile int countDownMilli = 0;
private Timer mTimer;
private ValueAnimator mValueAnimator;
public CountDownCircleView(Context context) {
super(context);
init();
}
public CountDownCircleView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public static int dip2px(float dip) {
return (int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP, dip, MyApplication.getApplication().getResources().getDisplayMetrics()
);
}
private void init() {
mPaint.setColor(Color.RED);
mPaint.setAntiAlias(true);
mPaint.setStrokeWidth(MyUtils.dip2px(1f));
mPaint.setStyle(Paint.Style.STROKE);
}
public void start() {
countDownMilli = COUNT + 1;
mAngel = 0f;
if (mTimer != null) {
mTimer.cancel();
}
if (mValueAnimator != null) {
mValueAnimator.cancel();
}
mValueAnimator = ValueAnimator.ofFloat(0f, 360f);
mValueAnimator.setDuration(COUNT * 1000);
mValueAnimator.setInterpolator(new LinearInterpolator());
mValueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
mAngel = (Float) animation.getAnimatedValue();
invalidate();
}
});
mValueAnimator.start();
mTimer = new Timer();
mTimer.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
countDownMilli—;
((Activity) getContext()).runOnUiThread(new Runnable() {
@Override
public void run() {
setText(countDownMilli + “”);
}
});
if (countDownMilli == 0) {
mTimer.cancel();
}
}
}, 0, 1000);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
RectF rectF = new RectF(PADDING, PADDING, getWidth() - PADDING, getHeight() - PADDING);
canvas.drawArc(rectF, 0f, mAngel, false, mPaint);
}
}
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